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https://issues.apache.org/jira/browse/HIVE-18713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364712#comment-16364712
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Vineet Garg commented on HIVE-18713:
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[~gopalv] Just a minor nitpick - cbo_rp_simple_select contains test for
{{RETURN PATH}} feature ({{set hive.cbo.returnpath.hiveop=true)}}. I think
{{cbo_simple_select}} would be better suited for the test.
> Optimize: Transform IN clauses to = when there's only one element
> -----------------------------------------------------------------
>
> Key: HIVE-18713
> URL: https://issues.apache.org/jira/browse/HIVE-18713
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Affects Versions: 3.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Major
> Attachments: HIVE-18713.1.patch, HIVE-18713.2.patch
>
>
> (col1) IN (col2) can be transformed to (col1) = (col2), to avoid the hash-set
> implementation.
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